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btrfs: re-introduce 'norecovery' mount option

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Although 'norecovery' mount option was marked as deprecated for a long
time and a warning message was printed during the deprecation window,
it's still actively utilized by several projects that need a safer way
to mount a btrfs without any writes.

Furthermore this 'norecovery' mount option is supported by other major
filesystems, which makes it less clear what's our motivation to remove
it.

Re-introduce the 'norecovery' mount option, and output a message to recommend
'rescue=nologreplay' option.

Link: https://lore.kernel.org/linux-btrfs/ZkxZT0J-z0GYvfy8@gardel-login/#t
Link: https://github.com/systemd/systemd/pull/32892
Link: https://bugzilla.suse.com/show_bug.cgi?id=1222429
Reported-by: Lennart Poettering <lennart@poettering.net>
Reported-by: Jiri Slaby <jslaby@suse.com>
Fixes: a1912f7121 ("btrfs: remove code for inode_cache and recovery mount options")
CC: stable@vger.kernel.org # 6.8+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2024-05-21 19:27:31 +09:30 committed by David Sterba
parent dddff821b6
commit 440861b1a0
1 changed files with 8 additions and 0 deletions
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8
fs/btrfs/super.c
View file

@ -119,6 +119,7 @@ enum {
Opt_thread_pool,
Opt_treelog,
Opt_user_subvol_rm_allowed,
Opt_norecovery,
/* Rescue options */
Opt_rescue,
@ -245,6 +246,8 @@ static const struct fs_parameter_spec btrfs_fs_parameters[] = {
__fsparam(NULL, "nologreplay", Opt_nologreplay, fs_param_deprecated, NULL),
/* Deprecated, with alias rescue=usebackuproot */
__fsparam(NULL, "usebackuproot", Opt_usebackuproot, fs_param_deprecated, NULL),
/* For compatibility only, alias for "rescue=nologreplay". */
fsparam_flag("norecovery", Opt_norecovery),
/* Debugging options. */
fsparam_flag_no("enospc_debug", Opt_enospc_debug),
@ -438,6 +441,11 @@ static int btrfs_parse_param(struct fs_context *fc, struct fs_parameter *param)
"'nologreplay' is deprecated, use 'rescue=nologreplay' instead");
btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY);
break;
case Opt_norecovery:
btrfs_info(NULL,
"'norecovery' is for compatibility only, recommended to use 'rescue=nologreplay'");
btrfs_set_opt(ctx->mount_opt, NOLOGREPLAY);
break;
case Opt_flushoncommit:
if (result.negated)
btrfs_clear_opt(ctx->mount_opt, FLUSHONCOMMIT);